1. Department of Pulmonary Circulation, Shanghai Pulmonary Hospital; Tongji University, School of Medicine; Shanghai China
2. Department of Pulmonary Function, Shanghai Pulmonary Hospital; Tongji University, School of Medicine; Shanghai China
3. Department of Statistics; the Second Military Medical University; Shanghai China
4. State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital; Peking Union Medical College and Chinese Academy of Medical Science; Beijing China